Thread-cutting tool



P. W. BRITTS.

THREAD CUTTING TOOL.

APPLICATION FILED NOV. 6 1919.

1,362,840. Patented Dec. 21,1920.

UNITED STATES PATENT OFFICE.

PETER W. BRITTS, OF NEWIPORT NEWS, VIRGINIA.

THREAD-CUTTING- TOOL.

Application filed November 6, 1919.

To all whom it may concern:

Be it known that 1, PETER TV. Bnir'rs, a citizen of the United States, residing at Newport News, in the county of \Varwick and State of l irginia, have invented a new and useful Thread-Cutting Tool, of which the following is a specification.

This invention relates to die-stocks or thread-cutting tools and has for an object the provision of means for employing interchangeable dies.

Tn existing die-stocks there are employed dies of predetermined configuration bearing identifying inscriptions in order that a selected die may be received in a selected die socket or holder. This arrangement in the present die-stocks is necessary in order to successfully cut the conventional helical thread upon pipes or other structures, and the operation is carried. out by providing a plurality of die-receiving sockets that are positioned in a plane which is perpendicularly disposed to the axis of the diestock, and the conventional thread is cut by having the cutting teeth of the initial die, usually, designated by the numeral 1, extending substantially throughout the cutting face of this die, and the remaining dies having their outermost cutting teeth successively positioned away from the outer terminal of the die-stock as these dies are positioned away from the initial die. This construction has proven highly unsatisfactory when working in darkness or semi-darkness, which condition frequently prevails in cellars, tunnels, etc., because it is impossible to see the number on the die without producing a light which usually occasions considerable inconvenience. When working on gas pipes it is then not safe to produce a light, for obvious reasons, and in this event it is necessary to convey the die-stock to some lighted position before the dies bearing the several numbers can be properly inserted in their corresponding sockets.

Another object of this invention is to provide a die -stock having its die-receiving sockets, so positioned that identical dies may be interchangeably employed in all its sockets thereby obviating the necessity of employing a designated die in a selected socket, thus relieving the operator of the necessity of locating a particular die for use in a selected socket when employing this device.

A. further object of this invention, is to provide means for employing dies that may Specification of Letters Patent.

Patented Dec. 21, 1920.

Serial No. 336,167.

only be inserted in their sockets in the correct or operating position; and the dies being so formed that they may be accurately alined in their sockets irrespective of the presence of dust or other extraneous matter within their sockets.

An additional object of this invention is to provide a die-stock of generally improved construction, whereby the device will be simple, durable, and inexpensive in construction, as well as convenient, practical, serviceable and efiicient in its use.

lVith the foregoing and other objects in view which will appear as the description proceeds, the invention resides in the combination and arrangement of parts and in the details of construction hereinafter de scribed and claimed, it being understood that changes in the precise embodiment of the invention herein disclosed, may be made within the scope of what is claimed without departing from the spirit of the invention.

The invention has been illustrated in its preferred embodiment in the accompanying drawings wherein Figure 1 is a plan view of: the die stock.

Fig. 2 is a longitudinal sectional view taken on a line 22 of Fig. 1, parts appear ing in elevation.

Fig. 3 is an enlarged sectional view taken through one of the die-receiving sockets,

and

Fig. dis a diagrammatical view illustrating the positions of the several die-receiving sockets.

Referring to the drawings there is shown a die-stock 5 having die-receiving sockets 6. Any preferred number of these sockets may be employed, and each socket is perpendicularly disposed with respect to the axis of the die-stock 5. These sockets are positioned spirally around the bore of the die-stock, so that one of the sockets is positioned at the extreme outer terminal of the die stock, and the remaining sockets 6 are positioned longitudinally and progressively away from the outer terminal of the die-stock as the said sockets are positioned around the die-stock away from the first mentioned socket. In order to insure that the dies are properly positioned, each socket is formed with three perpendicularly disposed side walls 7 and an oblique side wall 8, which forms a socket to conform to the configuration of improved dies 9. Each die 9 has three perpendicular disposed faces 10 and an oblique face 11,

and the cutting teeth 12 of each die extends throughout the entire operative or cutting terminal of the die. The opposed terminal of each die is ground-off or beveled as indicated at 13 so that if dust, particles of rust or other extraneous matter should be present in the socket this matter would be received in the space surrounding the tapered or frusto-conical terminal of the die and would not prevent the reduced face 1d from accurately engaging the end wall or inner terminal of the socket.

' In use, when it is desired to insert the dies in their sockets, the dies may be indiscriminately inserted in any of the sockets without reference to the number of the die or location of the socket and owing to the peculiar configuration of these dies they cannot be improperly positioned within their sockets. Thus it is only necessary to position the cutting end of the die toward the axis of the stock to insure its proper positioning within the socket.

Having thus described my invention, what is claimed is 1. A die-stock having die-receiving sockets spirally disposed around the axis of the said die-stock.

2. A die-stock having a plurality of diereceiving sockets, one of said sockets being positioned adjacent the outer terminal of the die-stock and the remaining sockets being positioned successively away from the outer terminal of the die-stock as the said sockets are positioned away from the first mentioned socket.

3. A die-stock having spirally arranged die-receiving sockets each of said sockets having perpendicularly disposed side walls and an oblique side wall.

4. A thread-cutting tool having a plurality of die-receiving sockets, said sockets being perpendicularly disposed with respect to the axis of the die-stock and spirally positioned about the axis of the die-stock, each socket having perpendicularly disposed side walls and an obliquely disposed side wall, dies interchangeably received within the said sockets and each die having perpendicularly disposed longitudinal faces and an obliquely disposed longitudinal face, one terminal of each die being tapered and the opposed terminal of each die having cutting teeth formed throughout its cutting terminal. In testimony that I claim the foregoing as my own, I have hereto affixed my signa ture in the presence of two witnesses.

PETER W. BRITTS. Witnesses:

IVY E. biiirrson, J. R. TOMLIN. 

